another schema violation

similar to https://github.com/JuliaData/Arrow.jl/issues/167
```julia
julia> signals
Arrow.Table with 15 rows, 11 columns, and schema:
:recording Base.UUID
:file_path String
:file_format String
:span TimeSpans.TimeSpan
:kind String
:channels Vector{String} (alias for Array{String, 1})
:sample_unit String
:sample_resolution_in_unit Float64
:sample_offset_in_unit Float64
:sample_type String
:sample_rate Float64

julia> Tables.rowtable(signals)
ERROR: TypeError: in new, expected Vector{String}, got a value of type SubArray{String, 1, Arrow.List{String, Int32, Vector{UInt8}}, Tuple{UnitRange{Int64}}, true}
Stacktrace:
[1] macro expansion
@ ~/.julia/packages/Tables/YzCZp/src/namedtuples.jl:46 [inlined]
[2] _iterate(rows::Tables.NamedTupleIterator{Tables.Schema{(:recording, :file_path, :file_format, :span, :kind, :channels, :sample_unit, :sample_resolution_in_unit, :sample_offset_in_unit, :sample_type, :sample_rate), Tuple{Base.UUID, String, String, TimeSpans.TimeSpan, String, Vector{String}, String, Float64, Float64, String, Float64}}, Tables.RowIterator{Tables.CopiedColumns{Arrow.Table}}}, st::Tuple{})
@ Tables ~/.julia/packages/Tables/YzCZp/src/namedtuples.jl:37
[3] iterate
@ ~/.julia/packages/Tables/YzCZp/src/namedtuples.jl:58 [inlined]
[4] iterate
@ ~/.julia/packages/Tables/YzCZp/src/namedtuples.jl:57 [inlined]
[5] copyto!(dest::Vector{NamedTuple{(:recording, :file_path, :file_format, :span, :kind, :channels, :sample_unit, :sample_resolution_in_unit, :sample_offset_in_unit, :sample_type, :sample_rate), Tuple{Base.UUID, String, String, TimeSpans.TimeSpan, String, Vector{String}, String, Float64, Float64, String, Float64}}}, src::Tables.NamedTupleIterator{Tables.Schema{(:recording, :file_path, :file_format, :span, :kind, :channels, :sample_unit, :sample_resolution_in_unit, :sample_offset_in_unit, :sample_type, :sample_rate), Tuple{Base.UUID, String, String, TimeSpans.TimeSpan, String, Vector{String}, String, Float64, Float64, String, Float64}}, Tables.RowIterator{Tables.CopiedColumns{Arrow.Table}}})
@ Base ./abstractarray.jl:843
[6] _collect(cont::UnitRange{Int64}, itr::Tables.NamedTupleIterator{Tables.Schema{(:recording, :file_path, :file_format, :span, :kind, :channels, :sample_unit, :sample_resolution_in_unit, :sample_offset_in_unit, :sample_type, :sample_rate), Tuple{Base.UUID, String, String, TimeSpans.TimeSpan, String, Vector{String}, String, Float64, Float64, String, Float64}}, Tables.RowIterator{Tables.CopiedColumns{Arrow.Table}}}, #unused#::Base.HasEltype, isz::Base.HasLength)
@ Base ./array.jl:608
[7] collect(itr::Tables.NamedTupleIterator{Tables.Schema{(:recording, :file_path, :file_format, :span, :kind, :channels, :sample_unit, :sample_resolution_in_unit, :sample_offset_in_unit, :sample_type, :sample_rate), Tuple{Base.UUID, String, String, TimeSpans.TimeSpan, String, Vector{String}, String, Float64, Float64, String, Float64}}, Tables.RowIterator{Tables.CopiedColumns{Arrow.Table}}})
@ Base ./array.jl:602
[8] rowtable(itr::Arrow.Table)
@ Tables ~/.julia/packages/Tables/YzCZp/src/namedtuples.jl:99
[9] top-level scope
@ REPL[15]:1

(jl_0M34Wq) pkg> st
Status `/tmp/jl_0M34Wq/Project.toml`
[fbe9abb3] AWS v1.41.0
[1c724243] AWSS3 v0.8.3
[e853f5be] Onda v0.13.6
[bd369af6] Tables v1.4.3
```

Reproduce the Julia example with Arrow.Table and Tables.rowtable using the shown schema, especially the Vector{String} channels column. Start at the Tables namedtuples.jl locations in the stack trace and compare with Arrow.jl issue 167. Done means rowtable can process this table without the reported TypeError.

Written by the indexing model from the issue text.